NEW and Improved Endurance MultiV is the first multinutrient vitamin that’s clinically proven to enhance endurance. -Now with Vitamins K2 and D. This unparalleled formulation contains a number of special ingredients that address the unique requirements of endurance athletes. In addition to having the highest-quality, most bio-available vitamins and chelated minerals available, this special endurance formula delivers clinically effective doses of enzymes, iron, Green Tea, Ginkgo Biloba and Omega-3 Fatty Acids. Endurance MultiV is formulated with Ferrochel Iron-a highly bioavailable source of iron which is non-toxic and does not affect the absorption of minerals, like other iron sources. MultiV is the only multivitamin that contains Carbogen® (U.S. Patent 5,817,350), a patented enzyme blend that's been clinically proven to increase time to exhaustion by 43%, reduce lactate levels by 58% and improve carbohydrate utilization.

i have progressively taken this along with the optygen hp for 1 month and results are above expectation.
endurance has gone up riding out the flats, however i have not stress tested the hills. will follow up in 3 weeks